1. Microcontroller: ATmega328
2. Circuit Operating Voltage: 3.3V
3. Clock frequency: 8MHz.
4. Digital I/O Pins: 14
5. 8 analog input port: A0 ~ A7.
6. A pair of TTL level serial port transceiver : RX / TX.
7. 6 PWM port: D3, D5, D6, D9, D10, D11.
8. Support serial download.
